What has serving humanity got to do with self-improvement? Absolulutely nothing.

So what you're saying is that people don't have a natural inclination to serve, and the only way they can get to be that way is to improve themselves.

That is complete and utter nonsense.

Some people are born selfish, and some people aren't. Some people are givers and some people are takers. Nothing one can do about one's character. It's innate.